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          <h4 id="title">Box Selection</h4>
          <p class="tags">
            <span class="badge-group">
              <a
                href="./index.html?q=DragBox" class="badge badge-info">DragBox</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="DragBox"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./box-selection.html&quot;&gt;Box Selection&lt;/a&gt;"
                tabindex="0"
                >1</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=feature" class="badge badge-info">feature</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="feature"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri.html&quot;&gt;ArcGIS REST Feature Service&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./box-selection.html&quot;&gt;Box Selection&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-animation.html&quot;&gt;Custom Animation&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-circle-render.html&quot;&gt;Custom Circle Render&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-interactions.html&quot;&gt;Custom Interactions&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri-edit.html&quot;&gt;Editable ArcGIS REST Feature Service&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./flight-animation.html&quot;&gt;Flight Animation&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-move-animation.html&quot;&gt;Marker Animation&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./translate-features.html&quot;&gt;Translate Features&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;"
                tabindex="0"
                >11</a>
            </span>
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              <a
                href="./index.html?q=selection" class="badge badge-info">selection</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="selection"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./box-selection.html&quot;&gt;Box Selection&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-tile-selection.html&quot;&gt;Vector Tile Selection&lt;/a&gt;"
                tabindex="0"
                >2</a>
            </span>
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                href="./index.html?q=box" class="badge badge-info">box</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="box"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./box-selection.html&quot;&gt;Box Selection&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./extent-interaction.html&quot;&gt;Extent Interaction&lt;/a&gt;"
                tabindex="0"
                >2</a>
            </span>
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          <div id="map" class="map"></div>
<div id="info">No countries selected</div>

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        <div class="span12">
          <p id="shortdesc">Using a DragBox interaction to select features.</p>
          <div id="docs"><p>This example shows how to use a <code>DragBox</code> interaction to select features. Selected features are added to the feature overlay of a select interaction (<code>ol/interaction/Select</code>) for highlighting.</p> <p>Use <code>Ctrl+Drag</code> (<code>Command+Drag</code> on Mac) to draw boxes.</p>
</div>
        </div>
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      <div class="row-fluid">
        <h5 class="source-heading">main.js</h5>
        <pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
import GeoJSON from &#x27;ol/format/GeoJSON&#x27;;
import Map from &#x27;ol/Map&#x27;;
import View from &#x27;ol/View&#x27;;
import {DragBox, Select} from &#x27;ol/interaction&#x27;;
import {OSM, Vector as VectorSource} from &#x27;ol/source&#x27;;
import {Tile as TileLayer, Vector as VectorLayer} from &#x27;ol/layer&#x27;;
import {platformModifierKeyOnly} from &#x27;ol/events/condition&#x27;;

var vectorSource &#x3D; new VectorSource({
  url: &#x27;data/geojson/countries.geojson&#x27;,
  format: new GeoJSON(),
});

var map &#x3D; new Map({
  layers: [
    new TileLayer({
      source: new OSM(),
    }),
    new VectorLayer({
      source: vectorSource,
    }) ],
  target: &#x27;map&#x27;,
  view: new View({
    center: [0, 0],
    zoom: 2,
    constrainRotation: 16,
  }),
});

// a normal select interaction to handle click
var select &#x3D; new Select();
map.addInteraction(select);

var selectedFeatures &#x3D; select.getFeatures();

// a DragBox interaction used to select features by drawing boxes
var dragBox &#x3D; new DragBox({
  condition: platformModifierKeyOnly,
});

map.addInteraction(dragBox);

dragBox.on(&#x27;boxend&#x27;, function () {
  // features that intersect the box geometry are added to the
  // collection of selected features

  // if the view is not obliquely rotated the box geometry and
  // its extent are equalivalent so intersecting features can
  // be added directly to the collection
  var rotation &#x3D; map.getView().getRotation();
  var oblique &#x3D; rotation % (Math.PI / 2) !&#x3D;&#x3D; 0;
  var candidateFeatures &#x3D; oblique ? [] : selectedFeatures;
  var extent &#x3D; dragBox.getGeometry().getExtent();
  vectorSource.forEachFeatureIntersectingExtent(extent, function (feature) {
    candidateFeatures.push(feature);
  });

  // when the view is obliquely rotated the box extent will
  // exceed its geometry so both the box and the candidate
  // feature geometries are rotated around a common anchor
  // to confirm that, with the box geometry aligned with its
  // extent, the geometries intersect
  if (oblique) {
    var anchor &#x3D; [0, 0];
    var geometry &#x3D; dragBox.getGeometry().clone();
    geometry.rotate(-rotation, anchor);
    var extent$1 &#x3D; geometry.getExtent();
    candidateFeatures.forEach(function (feature) {
      var geometry &#x3D; feature.getGeometry().clone();
      geometry.rotate(-rotation, anchor);
      if (geometry.intersectsExtent(extent$1)) {
        selectedFeatures.push(feature);
      }
    });
  }
});

// clear selection when drawing a new box and when clicking on the map
dragBox.on(&#x27;boxstart&#x27;, function () {
  selectedFeatures.clear();
});

var infoBox &#x3D; document.getElementById(&#x27;info&#x27;);

selectedFeatures.on([&#x27;add&#x27;, &#x27;remove&#x27;], function () {
  var names &#x3D; selectedFeatures.getArray().map(function (feature) {
    return feature.get(&#x27;name&#x27;);
  });
  if (names.length &gt; 0) {
    infoBox.innerHTML &#x3D; names.join(&#x27;, &#x27;);
  } else {
    infoBox.innerHTML &#x3D; &#x27;No countries selected&#x27;;
  }
});
</code></pre>
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      <div class="row-fluid">
        <h5 class="source-heading">index.html</h5>
        <pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
  &lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;Box Selection&lt;/title&gt;
    &lt;!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer --&gt;
    &lt;script src="https://unpkg.com/elm-pep"&gt;&lt;/script&gt;
    &lt;style&gt;
      .map {
        width: 100%;
        height:400px;
      }
      .ol-dragbox {
        background-color: rgba(255,255,255,0.4);
        border-color: rgba(100,150,0,1);
      }
    &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;div id&#x3D;&quot;info&quot;&gt;No countries selected&lt;/div&gt;
    &lt;script src="main.js"&gt;&lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
      </div>


      <div class="row-fluid">
        <h5 class="source-heading">package.json</h5>
        <pre><code id="example-pkg-source" class="language-json">{
  &quot;name&quot;: &quot;box-selection&quot;,
  &quot;dependencies&quot;: {
    &quot;ol&quot;: &quot;6.5.0&quot;
  },
  &quot;devDependencies&quot;: {
    &quot;parcel&quot;: &quot;^2.0.0-beta.1&quot;
  },
  &quot;scripts&quot;: {
    &quot;start&quot;: &quot;parcel index.html&quot;,
    &quot;build&quot;: &quot;parcel build --public-url . index.html&quot;
  }
}</code></pre>
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